AWE&reg; Wave&trade; FREE 5 YEAR CRASH REPLACEMENT* Men's Bicycle Helmet - Black/Lime Green, Size 56-58cm HELMET SIZE: 56-58cm. A Unisize Adjustment Headlock System At The Rear Of The Helmet Allows You To Make The Helmet The Perfect Fit Yourself VENTILATION: There Are An Amazing 24 Air Vents for maximum cooling (Including 9 Rear). MATERIAL: Its In-Mould Construction fuses the Polycarbonate Outer Shell With The Helmets Absorbing EPS Foam Inner Core, giving an exceptionally Lightweight and Strong Helmet. Dual-density EPS liner. LIGHTWEIGHT: Incredible lightweight material = 500g Approx, Making This Hardly Noticeable Whilst Cycling TESTING APPROVAL: The Helmet Is TUV Tested and conforms to EN 1078 standards. BEWARE: Far Eastern suppliers using CE Certified copies, Our Models are CE EN1078 TUV tested and certification issued from TUV Germany, guaranteed to conform to CE EN1078